Kyung-min, a businessman, and Jong-suk, a failed writer, are former schoolmates. During a reunion dinner they look back on their school days, when a particularly cruel group of students, "the dogs", exercised a reign of terror by hazing and bullying part of the other students, the "pigs". One day, Kim Chul, one of their mates, stood up to the "dogs", becoming the only hope of ending their tyranny. Fifteen years on, he remains a hero. But behind this figure, the two men recall the murky story of their bond.

Yeun Sang-ho was born in Seoul, Korea in 1978. After his debut short film, D-Day in 2000, his second short The Hell won Asian Ghost Award at the Short Shorts Film Festival Asia. His following Short Love is Protein was screened in Competition at the Curtocircuito Int'l Short Film Festival of Santiago de Compostela in 2009 and invited to the Mauvais Genre International Film Festival at the same year.The King of Pigs is his first debut feature.